Blackbeard and the Sandstone Pillar: When Lightning Strikes | Audrey Penn
In this new leg of a wild adventure, the kids follow the trail of the loot under hot pursuit, a trail that leads halfway around the world and to the bottom of the Atlantic Ocean. But this adventure uncovers a far deeper mystery, which begins with the discovery of a strange sandstone in the secret tunnel on Ocracoke Island.
Blackbeard and the Sandstone Pillar: When Lightning Strikes | 
